Villous adenomas are usually more sessile than tubular adenomas. The neoplastic cells in villous adenomas line variably long simple or branching papillae that are more exuberant than the normal villi of the duodenal mucosa. Villous adenomas are more likely to have high grade dysplasia or an associated invasive carcinoma than tubular adenomas 2

Villous adenomas are usually more sessile than tubular adenomas. The neoplastic cells in villous adenomas line variably long simple or branching papillae that are more exuberant than the normal villi of the duodenal mucosa. Villous adenomas are more likely to have high grade dysplasia or an associated invasive carcinoma than tubular adenomas 3